tiny grub nestling in frothy saliva 'nest'!

I've just found a few of these in my London garden - they are pale green/yellowish and about 2mm long. I think they are grubs or caterpillars...I only noticed them at all because they seem to exude a weird, frothy spit-like substance in which they sit, if that makes sense, usually in the join of two branches (noticed them in my shrub roses and sedum green roof mainly).

Hello! Spraying the froghoppers with jet of water isn't really a very friendly thing to do... the 'spit' is protecting the nymphs while they develop. They don't do any harm to plants at all so if you want to let them get on with being froghoppers, it's best to just leave them be.

agree with berghill...the odd few are ok but often they become many and weaken the plant. the hose is the answer...they wont die just move away. not really a friend to the gardener, are they? If so Im ready to learn

A few doesn't sound like a major infestation. I haven't seen any of these in years, I remember them in my parents garden and always found them really interesting. When my dad first told me they were cuckoo spit I took it literally and thought it was great that cuckoo's were spitting in our garden.

I too remember these from many years ago - we used to find them on loads ofplants but hadn't seem them forages. Now I've got them on my lavender bushes but not too many. I'll leave them alone since the concensus seems to be that they are harmless. What exactly are froghoppers and what do they eat when adult?